flag pkg support documentation

Author: lainio

assert/doc.go

@@ -52,6 +52,15 @@ error messages and diagnostic they need.
 
 Please see the code examples for more information.
 
+# Flag Package Support
+
+The assert package supports Go's flags. All you need to do is to call flag.Parse.
+And the following flags are supported (="default-value"):
+    -asserter="Prod"
+        A name of the asserter Plain, Prod, Dev, Debug (see constants)
+
+And assert package's configuration flags are inserted.
+
 Note. assert.That's performance is equal to the if-statement. Most of the
 generics-based versions are almost as fast. If your algorithm is
 performance-critical please run `make bench` in the err2 repo and decide case by

doc.go

@@ -89,6 +89,17 @@ tracer API:
 
 	err2.SetLogTracer(nil) // the default is nil where std log pkg is used.
 
+# Flag Package Support
+
+The err2 package supports Go's flags. All you need to do is to call flag.Parse.
+And the following flags are supported (="default-value"):
+    -err2-log="nil"
+        A name of the stream currently supported stderr, stdout or nil
+    -err2-panic-trace="stderr"
+        A name of the stream currently supported stderr, stdout or nil
+    -err2-trace="nil"
+        A name of the stream currently supported stderr, stdout or nil
+
 # Error handling
 
 Package err2 relies on declarative control structures to achieve error and panic